.header {
    position: relative;
    height: 45px;
    line-height: 45px;
    text-align: center;
    color: #333;
    font-size: 16px;
}

.header__back::before {
    position: absolute;
    left: 0;
    top: 50%;
    margin-top: -8px;
    content: '\20';
    width: 12px;
    height: 12px;
    border: #646464 solid 3px;
    border-top: none;
    border-right: none;
    transform: rotate(45deg);
  }

.header__back {
    position: absolute;
    left: 10px;
    padding-left: 16px;
    font-size: 14px;
}